Quick Connect push-to-connect refrigerant fittings quickly connect copper and aluminum linesets for mini-split and unitary HVAC units. With no flaring or brazing involved, refrigerant lines can be securely and safely connected by PRO-Fit Quick Connect in various. Single-use with quick-release removal; robust brass body, durable and reliable. Quick connect union's are a time saving, innovative solution that eliminates system refrigerant leaks due to poor flaring or incorrect torqueing and brazing. leak-proof double O-rings sealing. 5/8" union; for HVAC/R up to 870 psi (60 bar). Recommended for residential use, coated aluminum linesets, mini-split HVAC units, unitary indoor coils. Compatible with major refrigerants. UV resistant brass body. FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets.